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It’s a transparent jellyfish. Two or three are used to bring any two pieces of glass together to create double-glazing. Usually you can’t see the edges. They’re farmed in Indonesia – millions of them. I think their Latin name is doublus-glaziius. Remember Ted Moult? He fell into a writhing vat of them at the “Everest” double glazing factory and died a horrible death. Not widely known that.